One of the most important decisions for a region facing being invaded by locust swarms is if to use pesticides, which are effective and cost-efficient, but can damage ecosystems.
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Abeing invaded by locust swarms is if to use
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Bbeing invaded by locust swarms is whether they should be using
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Cbeing invaded by locust swarms is whether or not they use
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Dinvasion by locust swarms is if to use
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Einvasion by locust swarms is whether to use
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正确答案: E